diff --git a/testing/fuzzers/BUILD.gn b/testing/fuzzers/BUILD.gn
index 03e0610..b97c08f 100644
--- a/testing/fuzzers/BUILD.gn
+++ b/testing/fuzzers/BUILD.gn
@@ -485,6 +485,7 @@
   sources = [ "pdf_scanlinecompositor_fuzzer.cc" ]
   deps = [
     ":fuzzer_utils",
+    "../../core/fxcrt",
     "../../core/fxge",
     "../../third_party:pdfium_base",
   ]
diff --git a/testing/fuzzers/pdf_scanlinecompositor_fuzzer.cc b/testing/fuzzers/pdf_scanlinecompositor_fuzzer.cc
index 9bd59b2..deb6bfc 100644
--- a/testing/fuzzers/pdf_scanlinecompositor_fuzzer.cc
+++ b/testing/fuzzers/pdf_scanlinecompositor_fuzzer.cc
@@ -4,6 +4,7 @@
 
 #include <memory>
 
+#include "core/fxcrt/fx_safe_types.h"
 #include "core/fxge/cfx_cliprgn.h"
 #include "core/fxge/dib/cfx_dibitmap.h"
 #include "core/fxge/fx_dib.h"
@@ -42,6 +43,14 @@
   size -= kParameterSize;
   data += kParameterSize;
 
+  static constexpr uint32_t kMemLimit = 512000000;  // 512 MB
+  static constexpr uint32_t kComponents = 4;
+  FX_SAFE_UINT32 mem = width;
+  mem *= height;
+  mem *= kComponents;
+  if (!mem.IsValid() || mem.ValueOrDie() > kMemLimit)
+    return 0;
+
   auto src_bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
   auto dest_bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
   if (!src_bitmap->Create(width, height, src_format) ||